No sizes, no pictures of the actual vest, much less actually being on a person, and otherwise no proof that this even works. The pictures and description are highly unprofessional as well. I'd give it a pass.

I've heard about those things before. From what I understand, you're supposed to hook it up to eg. Battlefield. The vest has strong vibrating motors, and they turn on when you're hit in the place that you're hit in. Sensory feedback, one may say.

Still, I'm sure some buy only the vibrating pants, and play senran kagura.